Cleaning tool for filters



3931- DOLLINGER CLEANING TOOL FOR FILTERS Filed June 25, 1928 InventorLewis L- pollinfler.

4:- QMZ ?atented Nov. 3, 1931 UNITED STATES PATENT OFFICE LE'WIS L.DOLLINGEER, OF ROCHESTER, YORK, ASSIGNOR TO STA Y'NEW FILTERCORPORATION, OF ROCHESTER, NEW YORKfA CORPORATION OF NEW YORKApplication filed June 25,

This invention relates to cleaning tools for cleaning filters and hasfor'one of its'object-s,

to provide means whereby a cleaning fluid vide means whereby thecleaning fluid can be passed through the filtering material at a higherpressure or greater velocity than the pressure and velocity under whichthe fluid to be cleaned is passed therethrough.

These and other objects ofthis invention will be fully illustrated inthe drawings, described in the specification, and pointed out in theclaims at the end thereof.

In the accompanying drawings: I

Figure 1 is a side elevation and partial section of the cleaning tool.

Figure 2 is a top plan view and partial section of-the cleaning tool.

Figur 3 is a vertical sectional viewof the nozzles of the cleaning tool.

Figure 4c is a similar sectional view of a,

slightly modified form of the nozzles of the cleaning tool.

In the several figures of the drawings like reference numerals indicatelike parts.

The cleaning tool forming the subject matter of this invention isespecially adaptedfor use with air filters of the type illustrated in myprior application Serial No. 280.992 filed Mav 28. 1928. The tool is soconstructed that such a filter maybe easily and quickly cleaned by theuse of it.

In the drawings reference numeral 1 indicates the hollow handle of thetool, the lower end of which is provided with suitable connecting meanssuch as a thread 2 whereby a flexible hose (not shown) may be attachedto the handle. The handle 1 is of suitable diameter and extendsangularly to the nozzles w CLEANING woonroa rrwncas 1928. Serial No.288,243.

3 and 4 of the tool so that the tool can be readily held in position andhandled by the hand in cleaning the filter as illustrated in Figure 1.The upper end of the handle 1 terminates into the combined manifold andvalve casing 5 where the flow of the cleaning medium is controlled anddistributed into the nozzles 3 and 4.

The valve casing comprises a horizontal cylindrical duct in which thevalve sleeve 7 is mounted to slide. This valve sleeve is open at theinnerend but is closed at the outer end by means of the thumb *pieoe 7A.In the wall of the sle ve is provided the opening 8. This opening isnormally held out of register with the opening 9 in the upper end of thehollow handle so that the flowof air or other cleaning medium is shutoff at this point. The sleeve is also provided with a guide slot and astop pin or set screw 11 provided in the easing 5 projects into thisguide slot and limits the movement of the valve sleeve to' the length ofthis guide slot. The guide slot is Just long enough to allow a movementof the sleeve that will bring the hole 8 either into or out of registerwith the opening 9 in the upper end of the handle 1.-

Normally the openings are out of register sion spring 12 that surroundsthe outer end of the sleeve 7 and is in erposed between .and are held inthis position by the expan-- the rear of the valve casing and the flangeformed by the thumb piece 7A.

The nozzles 3 and 4 roject from the manifold and are suitably astenedtherein. Each nozzle consists of a tubular member that is open at theinnerend and closed at the outer end.- The nozzles are suitably spacedfrom each other and project from the manifold so that each nozzle isheld parallel to and in close proximity with the o ter surface of one ofthe filtering pockets 14 as illustrated in Figure 2. In the caseillustrated in Figure 2 the filtering pockets are slightly wedge shapedand the nozzles 3 and 4 therefor project at a slight angle from themanifold in order to keep the nozzles in contact with the filteringsurface the full that they straddled.

Eachof the nozzles is provided with a slit depth of the pocket 15 whichis located on the inside of each nozzle so that the slits of the nozzlesare directly opposite each other. Air under pressure is preferably usedfor cleaning the filters by means of this cleaning tool and thecompressed air is forced through the filtering surface in the reversedirection from the flow of the air that is being filtered by the filter.Thus the air to be filtered enters the filtering pockets in thedirection indicated by the arrows in Figure 2 while the compressed airfrom the nozzles of the cleaning tool is forced against the outersurface of the pockets and thru the filteringv material in the oppositedirection sothat any foreign matter adhering to the inside of thepockets is lplown off by the air from the cleaning too lhe foreignmatter thus blown off the inside surface of the pockets is at the sametime blown out of the pocket by the air that is forced through the endof the pocket from the opening 16. This opening is provided in themanifold at a point intermediate of the nozzles 3 and 4 and forms athird nozzle. lhe air that issues from this third nozzle blows throughthe filtering material at the end of the pockets and at right angles tothe air blown through the filtering material at the sides of thefiltering pockets. Any foreign matter blown off the sides of thefiltering pockets by nozzles 3 and a is thus at the same time blown outof the open end or intake of the pocket, by the nozzle 16. This preventsthe foreign matter from settling in the bottom of the pockets after ithas been blown off the filtering surface by the nozzles 3 and a.

The nozzles illustrated in Figure 4: have a flat surface on the opposingsides of the nozzles and the slit through which the air issues fromthese nozzles is located in the middle of this flat surface. The fiatsurface on each side of the slit is desirable because in holding theflat surface against the filtering surface it prevents the air issuingfrom the slit from blowing up or down the outside ofthe filteringsurface, so thatall of the air issuing from the nozzle is forced throughthe filtering surface at right angles thereto and efficiently blows elfthe foreign matter on the inside of the filtering pocket.

As illustrated in Figure 1 the tool is used by first inserting thenozzles between two consecutive filtering pockets so that the pair ofnozzles and the manifold which connects them straddles one completepocket. The valve sleeve 7 is then forced into the casing 5 by means ofthe thumb of the hand to allow the air to pass from the handle into themanifold and out through the nozzles as above pointed out. With the airissuing from the nozzle the tool is then moved up or down the 'leng.h ofthe pocket. This is repeated for neaaoee each pocket until the whole ofthe filter is clean.

As illustrated in section in Figures 3 and 4 the filtering surface 20 ofthe filter which preferably consists of a filtering cloth such as feltetc., is supported on a rigid frame formed of a metal screen 21 and bentinto the shape of the pockets illustrated in Figure 2. This frame servestwo purposes in that it not only supports the filtering material andholds it in its proper shape but also guides the cleaning tool as it isbeing moved over the filtering surface of one of the pockets. Thenozzles 3 and 4.- straddle the frame of the filtering pocket and arethus guided over the filtering surface and held in contact with it onthe movement of the tool from one end of the pocket to the other.

I claim:

1. A cleaning tool for filters comprising a manifold, a pair of nozzlesprojecting from said manifold and adapted to engage the outside ofopposing filtering surfaces, each of said nozzles having a slit therein,said slits being located opposite each other to direct the flow of thecleaning fiuid from the nozzles thru the filtering surfaces at rightanglesthereto and toward each other, a third nozzle in said manifoldlocated intermediate of said pair of nozzles to direct a portion of thecleaning fluid parallel to the filtering surface along the insidethereof and at right angles to the flow of the cleaning fluid issuingfrom said pair of nozzles.

2. A hand tool for cleaning filters cornprising a manifold, nozzlesprojecting therefrom, a hollow handle depending from said manifold, saidhollow handle having an opening connecting the inside of said handlewith the inside of said manifold, a valve sleeve ha ing an opening inthe wall thereof mounted to slide in said manifold over the openingleading from said hollow handle, and means for bringing the opening insaid valve sleeve into and out of register with the onening lead ingfrom said hollow handle.

3. A hand tool for cleaning filters comprising a manifold, a pair ofnozzles projecting from said manifold, each of said nozzles haw ing afiat face the flat face of one of said nozzles opposing the fiat face ofthe other, each of said fiat faces of said nozzles having a slittherein, said nozzles being adapted to straddle the filter to direct thecleaning fluid through the filtering surface at right angles thereto.

In testimony whereof I affi my Signature LEWIS L. DOLLINGER.

